More Macs left out in the cold

Unfortunately, this means that many older Macs are still left out, including older Mac Pro, Mac Mini, and even the original MacBook Air systems.

The culprit is suspected to be the GPUs in older Macs, which Ars Technica points out are still based on 32-bit graphics drivers created before 64-bit became standard.

OS X 10.6 Snow Leopard saw a similar culling of older Macs, phasing out support for PowerPC systems.

OS X 10.8 Mountain Lion will come packed with a number of new features bringing the experience closer to that of iOS with integration of iCloud and iMessage, as well as AirPlay mirroring, Share Sheets, an improved Safari, and Gatekeeper security.